Annealing effect in polyaniline-CSA upon moderate heating

Heating of polyaniline-CSA films in ambient air usually results in accelera ted ageing, as evidenced by a progressive disappearance of the crystallinit y and of the metallic features. However, after moderate heating (typically for 30 min at 135 degrees C), an annealing effect is observed: X ray diffra ction shows an increase of the crystallinity, while low temperature de cond uctivity, NIR reflectance and magnetoresistance data reveal that the transp ort properties are improved. with a more metallic behaviour.